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OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 1,020 $ 572 $ 255 $ 169
Bad debt expense (reversal) (45) (414) (1,281) (1,066)
Write-offs, net of recoveries 15 537 546 786
Ending balance $ 990 $ 449 $ 990 $ 449